<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex布局-主轴对齐方式</title>
    <style>
        .top {
            display: flex;
            /* justify-content: flex-start; */
            /* justify-content: flex-end; */
            /* 居中 */
            /* justify-content: center; */
            /* 父级剩余的尺寸分配成间距 */
            /* 弹性盒子之间的间距相等 */
            /* justify-content: space-between; */
            /* 间距出现在弹性盒子两侧 */
            /* 视觉效果：弹性盒子之间的间距是两端间距得2倍 */
            /* justify-content: space-around; */
            /* 各间距距都相等 */
            justify-content: space-evenly;
            height: 300px;
            border: 20px solid salmon;
        }

        .top div {
            width: 100px;
            height: 200px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="top">
        <div>1</div>
        <div>2</div>
        <div>3</div>
    </div>
</body>
 
</html>